General Description
The LD7520 is a low startup current, current mode PWM controller with green-mode power-saving operation. The SOP-8/DIP-8 package integrated functions such as the leading- edge blanking of the current sensing, internal slope compensation, line compensation, and several protection features. The protection functions include cycle-by-cycle current limit, OVP, OTP, and OLP. It provides the users a high efficiency, low external component counts solution for AC/DC power applications.
Furthermore, to satisfy various protection requirements, both latch-mode protection and auto-recoverable protection can be easily achieved by configuring LD 7520 in different operation modes.
The special green-mode control is not only to achieve the low power consumption but also to offer a non-audible-noise operation when the LD7520 is operating under light load or no load condition.
Features
• High-Voltage (500V) Startup Circuit
• Current Mode Control
• Non-Audible-Noise Green Mode Control
• UVLO (Under Voltage Lockout)
• LEB (Leading-Edge Blanking) on CS Pin
• Programmable Switching Frequency
• Internal Slope Compensation
• OVP (Over Voltage Protection) on Vcc
• OLP (Over Load Protection)
• 500mA Driving Capability
Applications
• Switching AC/DC Adaptor and Battery Charger
• Open Frame Switching Power Supply
• LCD Monitor/TV Power
Typical Application
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